I'd train a little passing in his first season, up to mediocre or so. This will also improve his driving. Later on, you will want to train Jump Shot or Driving for Forwards, which will help with the driving too. But that can wait for the beginning. If you can, train Passing and OD this season, fist Passing to mediocre-respectable, then OD if you still have the time to do so. Then spend the second and third season pounding his inside skills. Once those are where you want to have them, switch to JS or 1on1 training.
Also, congratulations for a nice trainee. Having only one real hole, and in a relatively easily trainable secondary skill to boot, with nice potential - definitely a keeper.